I dunno, I think a lot of those “round shit that spins” are defined as wheels. A pully consists of a wheel and something stretched over it and pulled. A gear is literally a “toothed wheel”. I could see an argument that a typical ball bearing consists of 2 wheels, an inner and outer.

Still though. Doors are everywhere. Cabinets, ovens, microwaves, fridges/freezers, washers and dryers, closets, etc. The trunk and hood of a car, the glove box, center console, the little storage compartments tucked away all over modern SUVs, hell there’s a door hiding the mirror on my driver’s and passenger’s sun shade in my car.

I think I could literally have this conversation back and forth all day. lol